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hmknightnc

Wilmington, NC

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Posted: 09/28/13 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

The MS Sunsaver MPPT automatically clams itself to 15 amps max output. You can put whatever size 24 volt panel you want to it. The technical libary on the MS website has a very good description of this capability and even provides examples of where exceeding the controllers nomimal max input solar power is a good thing.

Go For it, the controller is designed to do exactly what you are looking for

2oldman

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Posted: 09/28/13 02:53pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

MPPT controllers take the input voltage and current and convert it to the output voltage and current. He can possibly get 17A output
I think I'm confused in that he's charging at 12v, not 24, so the 15a still holds.

harold1946

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Posted: 09/28/13 03:03pm Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

CA Traveler wrote:

MPPT controllers take the input voltage and current and convert it to the output voltage and current. He can possibly get 17A output
I think I'm confused in that he's charging at 12v, not 24, so the 15a still holds.


To say it in another manner;
The MPPT controller receives the 24 volt input from the panel and adjusts it to 12 volt without reducing the amps.
Thats the readers digest version. It would take several pages to cover everything involved.
Read Handy Bob Blog.


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2oldman

otr

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Posted: 09/28/13 03:09pm Link  |  Quote  |  Print  |  Notify Moderator

harold1946 wrote:

The MPPT controller receives the 24 volt input from the panel and adjusts it to 12 volt without reducing the amps.
It would have to increase the amps, right? If it doesn't, better get a better controller.

SteveAE

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Posted: 09/28/13 03:36pm Link  |  Quote  |  Print  |  Notify Moderator

I use the Morningstar 15 MPPT with 300 watts of panels. This usage is permitted by Morningstar. Maximum output is just under 15 amps. Works great for me as am looking to optimize low light output and could care less about losing a few amps when the sun is high and bright. The controller is even more efficient at the higher (24) volt input. Should be a great system for you as long as you are happy with ~15 Amps.

Steve

69 Avion

Phoenix, Arizona

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Posted: 09/28/13 03:47pm Link  |  Quote  |  Print  |  Notify Moderator

I may just order two panels since the second panel has free shipping. Has anyone used the Morningstar Tri Star 45 watt MPPT controller? If one 250 watt 24 volt panel is good for about 17 amps then two should be good for 34 amps which means with two of these panels I should just go right to the 45 amp MPPT controller.

Lets hear from the folks that have the Morningstar Tri Star 45 amp MPPT controller.

With two of these panels working at optimum level, what size 110 volt inverter could it power through the batteries with minimal loss from the batteries during the optimum level?


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JiminDenver

Denver, Co

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Posted: 09/28/13 03:54pm Link  |  Quote  |  Print  |  Notify Moderator

Do you go up in altitude? My 230w panel sees a increase of over 50% at altitude, you may be loosing more than you think.

I've had good results using the Eco-worthy 20a MPPT controller with a single panel. I was hoping one of the really low cost ones would at least functions but no luck so I'll be getting a second Eco-worthy for the inverter bank.


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2oldman

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Posted: 09/28/13 04:28pm Link  |  Quote  |  Print  |  Notify Moderator

69 Avion wrote:

With two of these panels working at optimum level, what size 110 volt inverter could it power through the batteries with minimal loss from the batteries during the optimum level?
34 x 13= 442w. It will power any size inverter, but it will not support more than 442w draw from that inverter.

So I guess you could say about a 500w inverter. The easier way is to simply think of it as having 2-250w panels for a total of 500w.

* This post was edited 09/28/13 04:41pm by 2oldman *

time2roll

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Posted: 09/28/13 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

69 Avion wrote:

Lets hear from the folks that have the Morningstar Tri Star 45 amp MPPT controller.


I have the 60 amp driven by three 225w panels. In hindsight the 45a would have been fine even though Morningstar recommended the 60a. I really like the programmability of the 60a so all is good.


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KD4UPL

Swoope, VA

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Posted: 09/28/13 05:21pm Link  |  Quote  |  Print  |  Notify Moderator

Strictly by the numbers (250 watts/ 14.4 volts = 17.36 amps) that controller is not large enough.
In the real world it will probably work fine since it limits the output to protect itself. The drawback is that during periods of intense sun and/or low battery you will be loosing power.
Morningstar makes some great charge controllers. I've got two of the their 45A models installed at 2 different off grid cabins. I've had no problems from either. Blue Sky is another brand you should investigate. I've got even more of their controllers installed, also with no problems.

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